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Vijayakumar, Harshavardhanan,Thamilarasan, Senthil Kumar,Shanmugam, Ashokraj,Natarajan, Sathishkumar,Jung, Hee-Jeong,Park, Jong-In,Kim, HyeRan,Chung, Mi-Young,Nou, Ill-Sup MDPI 2016 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.17 No.8
<P>Plants, as sessile organisms, can suffer serious growth and developmental consequences under cold stress conditions. Glutathione transferases (GSTs, EC 2.5.1.18) are ubiquitous and multifunctional conjugating proteins, which play a major role in stress responses by preventing oxidative damage by reactive oxygen species (ROS). Currently, understanding of their function(s) during different biochemical and signaling pathways under cold stress condition remain unclear. In this study, using combined computational strategy, we identified 65 <I>Brassica oleracea</I> glutathione transferases (<I>BoGST</I>) and characterized them based on evolutionary analysis into 11 classes. Inter-species and intra-species duplication was evident between <I>BoGST</I>s and <I>Arabidopsis</I> GSTs. Based on localization analyses, we propose possible pathways in which <I>GST</I> genes are involved during cold stress. Further, expression analysis of the predicted putative functions for <I>GST</I> genes were investigated in two cold contrasting genotypes (cold tolerance and susceptible) under cold condition, most of these genes were highly expressed at 6 h and 1 h in the cold tolerant (CT) and cold susceptible (CS) lines, respectively. Overall, <I>BoGSTU19</I>, <I>BoGSTU24</I>, <I>BoGSTF10</I> are candidate genes highly expressed in <I>B. oleracea</I>. Further investigation of GST superfamily in <I>B. oleracea</I> will aid in understanding complex mechanism underlying cold tolerance in plants.</P>
Ashokraj Shanmugam,Arif Hasan Khan Robin,Senthil Kumar Thamilarasan,Harshavardhanan Vijayakumar,Sathishkumar Natarajan,김호택,박종인,노일섭 한국식물학회 2017 Journal of Plant Biology Vol.60 No.5
The Minichromosome maintenance protein [MCM(2-7)] complex is associated with helicase activity for replicationfork formation during DNA replication. We identified andcharacterized each 12 putative MCM genes from Brassicaoleracea and Brassica rapa. MCM genes were classified intonine groups according to their evolutionary relationships. Ahigh number of syntenic regions were present on chromosomesC03 and A03 in B. oleracea and B. rapa, respectively, comparedto the other chromosomes. Expression analysis showed thatmost of the MCM(2-7) helicase-subunit genes and their coregulatingMCM genes were upregulated during hydroxyurea(HU) induced stress in B. oleracea. In B. rapa, MCM(2-7)helicase genes BrMCM2_2, BrMCM7_1, BrMCM7_2 and theirco-regulating genes were upregulated during replicationstress. During cold stress, BoMCM6 in B. oleracea andBrMCM5 in B. rapa were remarkably upregulated. Duringsalt stress, BoMCM6_2, BoMCM7_1, BoMCM8, BoMCM9,and BoMCM10 were markedly upregulated in B. oleracea. Hence, our study identified the candidate MCM family genesthose possess abiotic stress-responsive behavior and DNAreplication stress tolerance. As the first genome-wide analysis ofMCM genes in B. oleracea and B. rapa, this work providesa foundation to develop stress responsive plants. Furtherfunctional and molecular studies on MCM genes will behelpful to enhance stress tolerance in plants.